A collection of lactic acid bacteria isolates from fish viscera was studied and investigated regarding to their functional properties and safety aspects. From these, three isolates GM1, GM2 and GM3 were identified as ...A collection of lactic acid bacteria isolates from fish viscera was studied and investigated regarding to their functional properties and safety aspects. From these, three isolates GM1, GM2 and GM3 were identified as Enterococcus feacium species using molecular methods. Partial Amplified rDNA Restriction Analysis (partial ARDRA) with restriction enzyme HaeIII separated these isolates into distinctive group which suggest genotypic variability within enterococci strains isolated from fish viscera. The three strains GM1, GM2 and GM3 exhibited antimicrobial activity. Indeed strains have been shown to produce bacteriocins with inhibitory effect against food spoilage bacteria and pathogenic fish including Carnobacterium maltaromaticum. The molecular mass of bacteriocin, as calculated by tricine-SDS-PAGE, was found to be 4.5 kDa. All isolates were tested positive upon PCR amplification of enterocin A structural gene. Investigations of antibiotic resistance show that the isolates were mostly sensitive to several antibiotics (ampicillin, penicillin, tetracycline, gentamycine) and resistance to rifampicin. All isolates grow in esculin azide agar as a selective medium for enumeration of probiotic enterococci. This study suggests that our strains can be employed as probiotic or to improve the safety of food products.展开更多
以阿根廷鱿鱼内脏为原料,探索动物蛋白酶提取鱿鱼内脏油的工艺条件。在单因素实验的基础上,以提取率为指标进行响应面优化实验,并对鱿鱼内脏油进行理化性质和脂肪酸组成分析。结果表明,最佳提取条件为:加酶量2.0%,p H 7.5,酶解温度50℃...以阿根廷鱿鱼内脏为原料,探索动物蛋白酶提取鱿鱼内脏油的工艺条件。在单因素实验的基础上,以提取率为指标进行响应面优化实验,并对鱿鱼内脏油进行理化性质和脂肪酸组成分析。结果表明,最佳提取条件为:加酶量2.0%,p H 7.5,酶解温度50℃,料液比1∶1.0(质量比),酶解时间4 h;在最佳条件下,鱿鱼内脏油提取率可达78.83%。所得鱿鱼内脏油的色泽呈浅红棕色,具有鱼油的腥味,无酸败臭味,理化指标均达到SC/T 3502—2000粗鱼油一级标准;鱿鱼内脏油中的多不饱和脂肪酸含量为41.66%,其中EPA和DHA总含量达35.42%。展开更多
文摘A collection of lactic acid bacteria isolates from fish viscera was studied and investigated regarding to their functional properties and safety aspects. From these, three isolates GM1, GM2 and GM3 were identified as Enterococcus feacium species using molecular methods. Partial Amplified rDNA Restriction Analysis (partial ARDRA) with restriction enzyme HaeIII separated these isolates into distinctive group which suggest genotypic variability within enterococci strains isolated from fish viscera. The three strains GM1, GM2 and GM3 exhibited antimicrobial activity. Indeed strains have been shown to produce bacteriocins with inhibitory effect against food spoilage bacteria and pathogenic fish including Carnobacterium maltaromaticum. The molecular mass of bacteriocin, as calculated by tricine-SDS-PAGE, was found to be 4.5 kDa. All isolates were tested positive upon PCR amplification of enterocin A structural gene. Investigations of antibiotic resistance show that the isolates were mostly sensitive to several antibiotics (ampicillin, penicillin, tetracycline, gentamycine) and resistance to rifampicin. All isolates grow in esculin azide agar as a selective medium for enumeration of probiotic enterococci. This study suggests that our strains can be employed as probiotic or to improve the safety of food products.
文摘以阿根廷鱿鱼内脏为原料,探索动物蛋白酶提取鱿鱼内脏油的工艺条件。在单因素实验的基础上,以提取率为指标进行响应面优化实验,并对鱿鱼内脏油进行理化性质和脂肪酸组成分析。结果表明,最佳提取条件为:加酶量2.0%,p H 7.5,酶解温度50℃,料液比1∶1.0(质量比),酶解时间4 h;在最佳条件下,鱿鱼内脏油提取率可达78.83%。所得鱿鱼内脏油的色泽呈浅红棕色,具有鱼油的腥味,无酸败臭味,理化指标均达到SC/T 3502—2000粗鱼油一级标准;鱿鱼内脏油中的多不饱和脂肪酸含量为41.66%,其中EPA和DHA总含量达35.42%。
